<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script src="../js/jquery-3.4.1.min.js"></script>
		<script>
			$(function(){
				//obj.removeAttribute('onlick');
				$("#b").one("click",function(){
					alert("only you");
				});
			});
		</script>
	</head>
	<body>
		<input type="button" value="起效一次" id="b"/>
	</body>
</html>
